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Digital droplet LAMP as a microfluidic app on standard laboratory devices

机译:数字液滴LAMP作为标准实验室设备上的微流应用程序

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Digital nucleic acid amplification methods are a growing research field that allows for absolute quantification of DNA making the need of standard curves redundant. However, most of the existing digital amplification systems require specialized laboratory devices and costly investments. The required disposable cartridges are device specific and not interchangeable. Here, we present digital droplet loop-mediated isothermal amplification (ddLAMP) as a microfluidic app on standard laboratory devices. ddLAMP is implemented on a disposable polymer chip (DropChip) in the format of a standard microscope slide. After off-chip DNA denaturation, the reaction mix is emulsified in the DropChip in a mini centrifuge for 6 minutes. The DropChip is transferred to an in situ thermal cycler for 1 hour of incubation. Afterwards, a fluorescence scan in a microarray scanner is performed. The DropChip allows for absolute quantification with a dynamic range of 15-1500 DNA copies per ml. Assay conditions were optimized for ddLAMP and comparison of ddPCR and ddLAMP for genomic E. coli DNA reveals very good concordance.
机译:数字核酸扩增方法是一个不断发展的研究领域,可以对DNA进行绝对定量,从而无需标准曲线。但是,大多数现有的数字放大系统需要专用的实验室设备和昂贵的投资。所需的一次性墨盒是特定于设备的,不可互换。在这里,我们介绍数字液滴环介导的等温扩增(ddLAMP)作为标准实验室设备上的微流应用程序。 ddLAMP以标准显微镜载玻片的形式在一次性聚合物芯片(DropChip)上实现。芯片外DNA变性后,将反应混合物在微型离心机中的DropChip中乳化6分钟。将DropChip转移到原位热循环仪中孵育1小时。之后,在微阵列扫描仪中进行荧光扫描。 DropChip可以进行绝对定量,其动态范围为每毫升15-1500个DNA拷贝。对ddLAMP的分析条件进行了优化,对ddPCR和ddLAMP对基因组大肠杆菌DNA的比较显示出非常好的一致性。

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